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1. Heterogeneous catalyst screening for fatty acid methyl esters production through interesterification reaction

Author:
Simões, S.S.; Ribeiro, J.S.; Celante, D.; Brondani, L.N.; Castilhos, F.
Source:
Renewable energy 2020 v.146 pp. 719-726
ISSN:
0960-1481
Subject:
magnesium oxide,   etc   ; acetates; biodiesel; catalysts; fatty acid methyl esters; fuel production; oils; screening; soybeans; temperature; zeolites;     Show all 11 Subjects
Abstract:
... This study aimed the investigation of a potential heterogeneous catalyst for the interesterification reaction for soybean biodiesel production. Different types of catalysts (Y Zeolite, MgO, Nb2O5 and mixed oxides) were tested in this work. Ca–Mg–Al mixed oxide with 40% wt. Ca was the more suitable catalyst for interesterification reaction. Effects of temperature, catalyst content and methyl acetat ...
DOI:
10.1016/j.renene.2019.07.023

2. All-Inorganic Quantum-Dot Light-Emitting Diodes with Reduced Exciton Quenching by a MgO Decorated Inorganic Hole Transport Layer

Author:
Jiang, Yibin; Jiang, Le; Yan Yeung, Fion Sze; Xu, Ping; Chen, Shuming; Kwok, Hoi-Sing; Li, Guijun
Source:
ACS applied materials & interfaces 2019 v.11 no.12 pp. 11119-11124
ISSN:
1944-8252
Subject:
magnesium oxide,   etc   ; light emitting diodes; nickel oxide;     Show all 3 Subjects
Abstract:
... Here, wide-bandgap magnesium oxide (MgO) is employed as a decorator for the nickel oxide (NiOₓ) hole transport layer (HTL), by means of a bulk dopant as well as a surface modifier. QLEDs with Ni₀.₈₈Mg₀.₁₂Oₓ serving as the HTL achieve an ∼19.5% efficiency improvement compared to devices using pristine NiOₓ. Further inserting an ultrathin MgO layer between the Ni₀.₈₈Mg₀.₁₂Oₓ and QDs to separate the ...
DOI:
10.1021/acsami.9b01742

3. Preparation and enhanced thermal conductivity of molten salt nanofluids with nearly unaltered viscosity

Author:
Wei, Xiaolan; Yin, Yue; Qin, Bo; Wang, Weilong; Ding, Jing; Lu, Jianfeng
Source:
Renewable energy 2020 v.145 pp. 2435-2444
ISSN:
0960-1481
Subject:
magnesium oxide,   etc   ; differential scanning calorimetry; heat transfer; nanofluids; nanoparticles; renewable energy sources; specific heat; thermal conductivity; thermal diffusivity; viscometers; viscosity;     Show all 11 Subjects
Abstract:
... In this work, a series of solar salt nano-fluids with 2.5 wt%, 3.5 wt%, 4.5 wt%, 5.0 wt% and 10.0 wt% MgO nanoparticles (∼60 nm, 18 W/m·K[24]) have been prepared and their thermal properties over 220 °C have been studied. The viscosity (η), density (ρ), specific heat capacity (cp) and thermal diffusivity (α) of the nano-fluids have been measured by rotary viscometer, Archimedean technique, differe ...
DOI:
10.1016/j.renene.2019.04.153

4. Structural and Electronic Properties of Frenkel and Schottky Defects at the MgO{100} Surface: Spin Polarization, Mid-Band Gap States, and Charge Trapping at Vacancy Sites

Author:
van Gog, Heleen; van Huis, Marijn A.
Source:
Journal of physical chemistry 2019 v.123 no.23 pp. 14408-14420
ISSN:
1932-7455
Subject:
magnesium oxide,   etc   ; density functional theory; energy; ions; magnesium; physical chemistry;     Show all 6 Subjects
Abstract:
... Recent experimental and simulation studies on the hydration of MgO suggest that physically and chemically induced surface defects strongly promote the reaction. The results of density functional theory calculations on the stability and the structural and electronic properties of Frenkel and Schottky defects at the MgO{100} surface performed in light of the surface chemistry of MgO are presented he ...
DOI:
10.1021/acs.jpcc.9b01908

5. Cataluminescence sensor for highly sensitive and selective detection of iso-butanol

Author:
Meng, Feifei; Lu, Zhenyu; Zhang, Runkun; Li, Gongke
Source:
Talanta 2019 v.194 pp. 910-918
ISSN:
0039-9140
Subject:
magnesium oxide,   etc   ; alcohols; detection limit; hydrogen; rapid methods;     Show all 5 Subjects
Abstract:
... In this paper, a gaseous sensor was described for detection of iso-butanol on the basis of its strong cataluminescence (CTL) emission on nano-MgO surface. The sensor showed high sensitivity and specificity to iso-butanol with response time less than 1 s and recovery time less than 18 s. A good linearly relationship between CTL intensity and the concentration of iso-butanol was observed in the rang ...
DOI:
10.1016/j.talanta.2018.11.016

6. Magnesia phosphate cement composite bipolar plates for passive type direct methanol fuel cells

Author:
Hao, Wenbin; Ma, Hongyan; Sun, Guoxing; Li, Zongjin
Source:
Energy 2019 v.168 pp. 80-87
ISSN:
0360-5442
Subject:
magnesium oxide,   etc   ; cement; electrochemistry; fuel cells; fuels; phosphates;     Show all 6 Subjects
Abstract:
... Bipolar plates composed of magnesia phosphate cement composite were fabricated via hot-press assisted hydration process. Techniques, including open circuit potential-time, alternating current impedance, and linear sweep voltammetry, were applied to the bipolar plates to investigate their electrochemical properties through both single cell and fuel cell stack at 70–90 °C. The results indicated that ...
DOI:
10.1016/j.energy.2018.11.094

7. Effects of nanoparticles to present a statistical model for the viscosity of MgO-Water nanofluid

Author:
Khodadadi, Hosein; Toghraie, Davood; Karimipour, Arash
Source:
Powder technology 2019 v.342 pp. 166-180
ISSN:
0032-5910
Subject:
magnesium oxide,   etc   ; nanofluids; nanoparticles; powders; statistical models; temperature; viscosity;     Show all 7 Subjects
Abstract:
... In this paper, the rheological behavior of MgO-Water nanofluid at different temperatures ranging from 25 °C to 60 °C and different volume fractions ranging from 0.07% to1.25% has been examined. Suspensions were prepared by dispersing MgO nanoparticles in Water. Viscosities were measured at the different shear rate range of 6.115 s−1 to 73.38 s−1. Results showed that the base fluid exhibits Newtoni ...
DOI:
10.1016/j.powtec.2018.09.076

8. Substrate-anchored solid solution catalysts for high density SWNTs growth

Author:
Tang, Lei; Luo, Yuting; Zhang, Shuchen; Zhang, Qichong; Yao, Yagang; Zhang, Jin
Source:
Carbon 2018 v.126 pp. 313-318
ISSN:
0008-6223
Subject:
magnesium oxide,   etc   ; annealing; carbon; catalysts; cobalt; hydrogen;     Show all 6 Subjects
Abstract:
... A novel substrate-anchored catalyst, solid solution, was developed, which experienced the annealing treatment of the single crystal MgO substrates with Co species deposited. The formation of specific structure on MgO surface and sub-surface makes Co catalysts anchored. Subsequent H2 reduction treatment continuously released fresh active catalysts from this anchored special structure for SWNTs nucl ...
DOI:
10.1016/j.carbon.2017.09.096

9. Magnesium oxide nanoparticles dispersed solar salt with improved solid phase thermal conductivity and specific heat for latent heat thermal energy storage

Author:
Saranprabhu, M.K.; Rajan, K.S.
Source:
Renewable energy 2019 v.141 pp. 451-459
ISSN:
0960-1481
Subject:
magnesium oxide,   etc   ; latent heat; nanoparticles; renewable energy sources; solidification; specific heat; temperature; thermal conductivity; thermal energy;     Show all 9 Subjects
Abstract:
... Composites comprising MgO nanoparticles as the dispersed phase and solid phase solar salt as the matrix have been prepared through solid-state mixing. The inclusion of MgO nanoparticles had very little influence on the solid-liquid phase change temperature and the latent heat of solar salt. However, the solid phase thermal conductivity of MgO-solar salt was elevated by 17.5% with the dispersion of ...
DOI:
10.1016/j.renene.2019.04.027

10. Clean magnesium production using concentrated solar heat in a high-temperature cavity-type thermochemical reactor

Author:
Chuayboon, Srirat; Abanades, Stéphane
Source:
Journal of cleaner production 2019 v.232 pp. 784-795
ISSN:
0959-6526
Subject:
magnesium oxide,   etc   ; activated carbon; air; catalytic cracking; feedstocks; heat; magnesium; methane; oxidation; prototypes; reducing agents; temperature;     Show all 12 Subjects
Abstract:
... The synthesis of magnesium from the corresponding oxide via a solar carbo-thermal and methano-thermal reduction process using high-temperature concentrated solar heat was investigated. The reduction of magnesium oxide (MgO) was experimentally demonstrated in a directly-irradiated prototype solar reactor at reduced pressure and temperature up to ∼1650 °C. The solar reactor was successfully operated ...
DOI:
10.1016/j.jclepro.2019.05.371

11. The influence of disposed fly ash on Ca2+ leaching and physico-mechanical properties of mortars

Author:
Turgut, Paki; Demir, Feridun
Source:
Journal of cleaner production 2019 v.226 pp. 270-281
ISSN:
0959-6526
Subject:
magnesium oxide,   etc   ; calcium; chemical composition; fly ash; landfills; leaching; pH; power plants; rain; snow; sulfites;     Show all 11 Subjects
Abstract:
... Fly ash of some thermal power plants is rejected when their chemical compositions do not satisfy the limit values in related standards and consequentially conveyed to landfills. In this study, a rejected fly ash, which has high sulphite, free lime, and magnesium oxide contents and does not comply with the classification standards of fly ashes, having cementing properties, has been examined. This r ...
DOI:
10.1016/j.jclepro.2019.04.105

12. The effect of chemical reagents on flotation performance of a pentlandite ore: An attainable region approach

Author:
Sibanda, V.; Khan, R.; Danha, G.
Source:
Powder technology 2019 v.352 pp. 462-469
ISSN:
0032-5910
Subject:
magnesium oxide,   etc   ; carboxymethylcellulose; magnesium; minerals; nickel; powders; silicon; synergism; South Africa;     Show all 9 Subjects
Abstract:
... Chemical reagents are used in flotation processes to improve the recovery of minerals as well as facilitate the rejection of gangue material. In this article, we conduct laboratory scale flotation tests on a pentlandite ore obtained from Nkomati mine in South Africa. We then investigate the effects of a collector (sodium isobutyl xanthate) and a depressant (carboxymethyl cellulose) on the flotatio ...
DOI:
10.1016/j.powtec.2019.04.062

13. Strain-Induced Cluster Glass State in LaMnO₃ Films

Author:
Liang, Yong Mei; Wang, Zhan Jie; Bai, Yu; Wu, Ying Jie; Ning, Xing Kun; Zhao, Xin Guo; Liu, Wei; Zhang, Zhi Dong
Source:
Journal of physical chemistry 2019 v.123 no.23 pp. 14842-14848
ISSN:
1932-7455
Subject:
magnesium oxide,   etc   ; ferrimagnetic materials; ferromagnetism; glass; ions; magnetic properties; manganese; physical chemistry; tensile strength;     Show all 9 Subjects
Abstract:
... Strain effect has great influence on the magnetic properties of manganite films. Here, we report a new phenomenon in which the biaxial tensile strain can induce the formation of the cluster glass state in LaMnO₃ (LMO) films. By comparing the properties of the LMO films grown on the LaAlO₃, SrTiO₃, and MgO substrates, the mechanism of the formation of the cluster glass state in LMO films was invest ...
DOI:
10.1021/acs.jpcc.9b03178

14. Study on Sulfur Conversion Characteristics in Catalytic Cracking of Coal Tar in the Presence of Dolomite-Supported Catalysts

Author:
Meng, Dechang; Zhang, Yaqing; Wang, Zhenhua; Qu, Xuan; Gao, Junqiang; Jiao, Tiantian; Liang, Peng
Source:
Energy & fuels 2019 v.33 no.6 pp. 5102-5109
ISSN:
1520-5029
Subject:
magnesium oxide,   etc   ; carbon; catalysts; catalytic cracking; coal tar; disulfides; dolomite; iron; nickel; pollutants; sulfur; temperature; thiols;     Show all 13 Subjects
Abstract:
... To investigate sulfur redistribution in the process of tar catalytic cracking, nature dolomite, Ni-based dolomite, Fe-based dolomite, and Ni/Fe-based dolomite catalysts were prepared. The effect of thioanisole, 1-octanethiol, and 1-benzothiophene on sulfur distribution of tar cracking products was explored in a self-made fixed-bed reactor. The results showed that sulfur poisoning and carbon deposi ...
DOI:
10.1021/acs.energyfuels.9b00832

15. Correlation of Sub-micrometer Ash Formation from Pulverized Biomass Combustion with Ash Composition

Author:
Jiang, Lyuxiao; Sheng, Changdong
Source:
Energy & fuels 2019 v.33 no.7 pp. 5893-5902
ISSN:
1520-5029
Subject:
magnesium oxide,   etc   ; aerodynamics; biomass; burning; calcium oxide; coal; combustion; particulates; regression analysis; silica;     Show all 10 Subjects
Abstract:
... The present work investigated the relationship of sub-micrometer ash (inorganic particulate matter with an aerodynamic diameter of <1 μm, PM₁) formation from pulverized biomass combustion with fuel ash composition. PM₁ yields from burning pulverized biomasses under similar experimental conditions, together with ash composition of the parent fuels, were gathered from the literature. The correlation ...
DOI:
10.1021/acs.energyfuels.8b04208

16. Centripetal filtration of groundwater to improve the lifetime of an MgO recycled refractory filter: observations and technical challenges

Author:
de Repentigny, Carl; Zagury, Gérald J.; Courcelles, Benoît
Source:
Environmental science and pollution research international 2019 v.26 no.15 pp. 15314-15323
ISSN:
0944-1344
Subject:
magnesium oxide,   etc   ; cobalt; filters; filtration; groundwater; nickel; pH; porosity; tracer techniques; water pollution;     Show all 10 Subjects
Abstract:
... In the context of improving permeable reactive barrier (PRB) filters, axial and a centripetal column tests were performed to compare their evolution in terms of chemical and hydraulic performances. For both tests, the MgO reactive media, made of crushed (< 10 mm) spent MgO–C refractory bricks was used to treat water contaminated with Co and Ni by raising the pH and promoting hydroxide precipitatio ...
DOI:
10.1007/s11356-019-04910-y

17. High-solids hydrolysis of corn stover to achieve high sugar yield and concentration through high xylan recovery from magnesium oxide-ethanol pretreatment

Author:
Li, Jun; Zhang, Meng; Wang, Donghai
Source:
Bioresource technology 2019 v.280 pp. 352-359
ISSN:
0960-8524
Subject:
magnesium oxide,   etc   ; biomass; cellulose; corn stover; enzymatic hydrolysis; ethanol; hydrolysis; lignin; magnesium; mixing; polysorbates; sugars; xylan;     Show all 13 Subjects
Abstract:
... MgO-ethanol pretreatment was studied to boost sugar conversions and concentrations during enzymatic hydrolysis. Although corn stover pretreated by MgO and 50% ethanol had the highest glucan and xylan recoveries (89 and 71%), excessive xylan/glucan ratio (54.8%) hinders the access of enzyme to internal cellulose and hemicellulose and only 57% glucan and 46% xylan conversions and 43 g/L sugars were ...
DOI:
10.1016/j.biortech.2019.02.058

18. Adapting the MgO-CO2 working pair for thermochemical energy storage by doping with salts

Author:
Shkatulov, A.I.; Kim, S.T.; Miura, H.; Kato, Y.; Aristov, Yu.I.
Source:
Energy conversion and management 2019 v.185 pp. 473-481
ISSN:
0196-8904
Subject:
magnesium oxide,   etc   ; acetates; additives; carbon dioxide; carbonation; energy; heat; heat pumps; lithium; nitrates; screening; temperature;     Show all 12 Subjects
Abstract:
... In this work, the MgO-CO2 working pair has been adapted for thermochemical energy storage (TCES) at medium temperatures by the MgO modification with inorganic salts to promote the TCES dynamics. Brief screening of modifying salts showed that lithium acetate (LiOAc) and mixed lithium-potassium nitrate (Li0.42K0.58NO3) additives could considerably promote the MgO carbonation at P(CO2) ≤10 bar and T ...
DOI:
10.1016/j.enconman.2019.01.056

19. A new and highly efficient conservation treatment for deacidification and strengthening of aging paper by in-situ quaternization

Author:
He, Bei; Lin, Qixuan; Chang, Minmin; Liu, Chuanfu; Fan, Huiming; Ren, Junli
Source:
Carbohydrate polymers 2019 v.209 pp. 250-257
ISSN:
0144-8617
Subject:
magnesium oxide,   etc   ; acidification; anti-aging properties; corrosion; deacidification; isopropyl alcohol; nanoparticles; pH; tensile strength;     Show all 9 Subjects
Abstract:
... Ancient papers, facing the threat of acidification, aging and microbial corrosion, need to be repaired due to their significance of history, art and culture research. In this work, a new and highly efficient approach was proposed to deacidify and strengthen aging paper by in-situ quaternization for the conservation, in which MgO nanoparticles dispersed in hexamethyldisiloxane was coated on the pap ...
DOI:
10.1016/j.carbpol.2019.01.034

20. Volcanic sources and diagenetic alteration of Permian–Triassic boundary K-bentonites in Guizhou Province, South China

Author:
Hong, Hanlie; Zhao, Lulu; Fang, Qian; Algeo, Thomas J.; Wang, Chaowen; Yu, Jianxin; Gong, Nina; Yin, Ke; Ji, Kaipeng
Source:
Palaeogeography, palaeoclimatology, palaeoecology 2019 v.519 pp. 141-153
ISSN:
0031-0182
Subject:
magnesium oxide,   etc   ; clay; diagenesis; extinction; feldspar; geochemistry; illite; kaolinite; lepidocrocite; quartz; smectite; volcanic ash; weathering; China;     Show all 14 Subjects
Abstract:
... Terrestrial Permian–Triassic boundary (PTB) sequences in South China usually contain one to three ash beds (K-bentonites), which provide evidence of a possible trigger for the terrestrial mass extinction and are useful as a distinct marker for correlation of the PTB boundary interval from terrestrial to marine areas. Here, we investigate the clay mineralogy and geochemistry of ash beds in the Zhej ...
DOI:
10.1016/j.palaeo.2018.01.019